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The Time Domain Reflectometer (TDR) feature allows you to determine if a cable is OPEN or SHORT

when it is at fault.

To start the TDR test, perform this task:

Step 1 (Starts the TDR test): test cable-diagnostics tdr {interface {interface-number}}

Step 2 (Displays the TDR test counter information): show cable-diagnostics

tdr {interface interface-number}

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9600/software/release/16-

11/configuration_guide/int_hw/b_1611_int_and_hw_9600_cg/checking_port_status_and_connectivity

pdf

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IPv6 source guard is an interface feature between the populated binding table and data traffic

filtering. This feature enables the device to deny traffic when it is originated from an address that is

not stored in the binding table. IPv6 source guard does not inspect ND or DHCP packets;rather, it

works in conjunction with IPv6 neighbor discovery (ND) inspection or IPv6 address glean, both of

which detect existing addresses on the link and store them into the binding table.

In this IP SLA tracking, we don’t need a IP SLA Responder so the command “ip sla responder” on R6 is

not necessary.

We also notice that the ACL is blocking ICMP packets on both interfaces E0/0 & E0/1 of R6 so we need

to allow ICMP from source 10.10.10.1 to destination 10.66.66.66.